| /**************************************************************** |
| * Licensed to the Apache Software Foundation (ASF) under one * |
| * or more contributor license agreements. See the NOTICE file * |
| * distributed with this work for additional information * |
| * regarding copyright ownership. The ASF licenses this file * |
| * to you under the Apache License, Version 2.0 (the * |
| * "License"); you may not use this file except in compliance * |
| * with the License. You may obtain a copy of the License at * |
| * * |
| * http://www.apache.org/licenses/LICENSE-2.0 * |
| * * |
| * Unless required by applicable law or agreed to in writing, * |
| * software distributed under the License is distributed on an * |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * |
| * KIND, either express or implied. See the License for the * |
| * specific language governing permissions and limitations * |
| * under the License. * |
| ****************************************************************/ |
| |
| package org.apache.james.mime4j; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| /** |
| * <code>InputStream</code> used by the parser to wrap the original user |
| * supplied stream. This stream keeps track of the current line number and |
| * can also be truncated. When truncated the stream will appear to have |
| * reached end of file. This is used by the parser's |
| * {@link org.apache.james.mime4j.MimeStreamParser#stop()} method. |
| * |
| * |
| * @version $Id: RootInputStream.java,v 1.2 2004/10/02 12:41:10 ntherning Exp $ |
| */ |
| class RootInputStream extends InputStream { |
| private InputStream is = null; |
| private int lineNumber = 1; |
| private int prev = -1; |
| private boolean truncated = false; |
| |
| /** |
| * Creates a new <code>RootInputStream</code>. |
| * |
| * @param in the stream to read from. |
| */ |
| public RootInputStream(InputStream is) { |
| this.is = is; |
| } |
| |
| /** |
| * Gets the current line number starting at 1 |
| * (the number of <code>\r\n</code> read so far plus 1). |
| * |
| * @return the current line number. |
| */ |
| public int getLineNumber() { |
| return lineNumber; |
| } |
| |
| /** |
| * Truncates this <code>InputStream</code>. After this call any |
| * call to {@link #read()}, {@link #read(byte[]) or |
| * {@link #read(byte[], int, int)} will return |
| * -1 as if end-of-file had been reached. |
| */ |
| public void truncate() { |
| this.truncated = true; |
| } |
| |
| /** |
| * @see java.io.InputStream#read() |
| */ |
| public int read() throws IOException { |
| if (truncated) { |
| return -1; |
| } |
| |
| int b = is.read(); |
| if (prev == '\r' && b == '\n') { |
| lineNumber++; |
| } |
| prev = b; |
| return b; |
| } |
| |
| /** |
| * |
| * @see java.io.InputStream#read(byte[], int, int) |
| */ |
| public int read(byte[] b, int off, int len) throws IOException { |
| if (truncated) { |
| return -1; |
| } |
| |
| int n = is.read(b, off, len); |
| for (int i = off; i < off + n; i++) { |
| if (prev == '\r' && b[i] == '\n') { |
| lineNumber++; |
| } |
| prev = b[i]; |
| } |
| return n; |
| } |
| |
| /** |
| * @see java.io.InputStream#read(byte[]) |
| */ |
| public int read(byte[] b) throws IOException { |
| return read(b, 0, b.length); |
| } |
| } |